Which one of the following statements with regard to ultrasonic waves is NOT correct?
[amp_mcq option1=”Ultrasonic waves have frequency above 20 kHz” option2=”Ultrasonic waves are longitudinal waves” option3=”Ultrasonic waves can travel through water” option4=”Ultrasonic waves can travel through vacuum” correct=”option4″]
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UPSC Geoscientist – 2021
Ultrasonic waves are sound waves with frequencies above the upper audible limit of human hearing (typically above 20 kHz). Like all sound waves, they are mechanical waves, meaning they require a material medium (solid, liquid, or gas) to propagate. They cannot travel through a vacuum.
Mechanical waves transport energy through the vibration of particles in a medium. In a vacuum, there are essentially no particles to vibrate, so mechanical waves cannot propagate.